Device for indicating the level of liquids



J.E. SCHEEL ET AL DEVICE FOR INDICATING THE LEVEL OF'I'IIQUIDS sept. 19, 1933.

Filed Ju1y2, 1928 IIIIIIIIII; l l

A/f @MZ/HMM@ Patented Sept. 19, 1933 UNITED 4- STATI-:s

DEVICE -For:

Joachim Erik scheel;

dorf, Karlsruhe,

INDICATING THE LEVEL F LIQUIDS Karlsruhe, Werner Herbert Bull, Durlach, and Rudolf Carl von Frey- Germany Appiirion July z, weasel-iai Nn. 289,883, and

in Ge many July 23, 1927 and at the level of the liquid is a measure of the height of the liquid level in the container.

The known devices of this description fail however when measuring the level of liquids containedin moving containers and which in consequence are considerably agitated for example in oil and petrol tanks on aircraft or on motor vehicles. When measuring the level of liquids in such' containers the immersed pipe must be so formed that transitory iiuctuations in pressure in the'event of vibrations oriiows do not substantially aifect the pressure gauge adjustment.v

According to the present invention the immersed pipe is formed as a chamber or system of chambers having one or' more openings. the system of end of the with between, the gas and tlie liquid inside thev system of chambers lies below the highest level at which the gas passes out of the chamber system. A capillary action at the dividing sur'- face is if pos/sible avoided, or if it is expressly utilized, it is maintained practically constant by sui termining the dividing surface between the gas and the liquid. 'I'he dividing surface between the 4o -gas and liquid in the chamber is made as large as possible. In addition a suitable damping in the movement of the 4dividing surface at this point is brought about. Independently of the 45, conditions immediately on theY dividing surface, a suitable damping of the movements of the inflowing and outflowing gases and liquids is ef- Iected by the formation of the chambers or the system of chambers and by the dimensions of the openings, that is, the discharge of gas and liquid is throttled. Finally care is taken that the difference in pressure, which exists between the dividing surface in the chamber and the level oi the liquid in the container even in the event 5 of fluctuations is maintained so long as possible,

The invention is illustrated by way of example inthe accompanying drawing wherein: Fig. 1 illustrates diagrammatcally a device for indicating or measuring the level o! liquids in. I0 containers.l f v scale renders possible The chambers and openings inv .liquid vapor. 8 is a bly dimensioning the chamber part de Figs. 2 and 6 illustrate opening permitting ,oi the liquid inside Figures 2, 3, 4 and 6 illustrate, in vertical section, details of various forms of my invention, while; 7 y

Figure 5 is a cross section taken on the line A-Brof Figure 2.

In Fig. 1, 1 is an excess pressure container which 'if-necessary is connected to pipe 1l. 2 is the immersed pipe shown without chambers and Y3 is a pressure gauge which if desired may also be given other forms of construction and may for example be constructed so that its a linear reading of the liquid content to be measured in containers of any desired form. 16 isv a damping point for the pressure gauge. tween one side of the pressure gauge and the gas over` the level of the liquid in the container. If the latter is under atmospheric pressure only, the connecting pipe may be dispensed with. 6 is a connecting pipe between a pressure `producer '1 and the gas in the space overl the liquid the level of which is to be measured. This connecting pipe as in 'the dispensed with. If the pipe 6 is present, it serves to take the pressure gas out of the liquid container, so that it is not necessary at each measuring to blow unsaturated gas through the liquid, this fresh gas being not saturated with cock for equalizing the pressure between pipes 5 and 11. 9 is the container The non-return valves, grammatically in Fig. 1 by their chamber and by the valve core shown as a circle. The contact surface of the seat of theA valve is shown as a conical part of the valve chamber, the valve core being illustrated as being pressed by spring pressure against the seat. It follows therefrom that the direction of ow in each of the one-way valves extends from the conical side to the fiat side of the chamber. The valves .are opened during the action f the pump by the pressure of by way of example the manner in which the end of the immersed pipe can be formed asa system of chambers accord- As shown the immersed pipe 22 has a ballshaped chamber 23 atthe end. thereof the dimensions of the pipe and chamber being dependent upon the volume of lgas to be expelled during measuring. 24 is a second pipe chamber by an opening 25 of which the liquid enters to a height determining the dividing surface between gas and id, whilst the rover-flowing gas escapes through opening 26. 27 is an communication between the liquid inside and outside the chamber 23. 28 are ribs .or nets for the suppgession of oscillations the chamber 23.

5 is a connecting pipe be'y case of pipe 5 may be are \indicated diacases be eiected either The size and geometrical shape of the opening 25 is determined in conjunction with the diameter of the ball-shaped chamber 23 at this point so that having regard to the nature of the liquid and the material used in construction the capillary action is 'substantially constant. At the opening 2'? no capillary action occurs as it adjusts liquid against liquid. By means of this or should escape from same in case of vibrations.

For all kinds of immersed pipe embodiments it is desirable to protect the holes against fouling by means of sieves, such as 29.` Moreover by means of a further chamber 31 with openings therein the condition can be fulfilled that the difference in pressure serving as standard for the measurements 1s maintained even in the case of violent oscillations. By means of the chamber 31 a determined path through the liquid can also be imparted to the escaping gas.

Fig. 3 illustrates a further embodiment of the invention in which 32 is the immersed pipe having at the end thereof a chamber 33 which coming 37.

Fig. 4 illustrates a further embodiment of the invention in which 38 is the immersed pipe having a chamber 39 at the end thereof sub-divided by partitions 40 and 41. 42 is a. gas outlet pipe whilst 43 and 44 are openings for equalizing the liquid pressure. In the case of excessive initial gas pressure the latter serve for equalizing the gas pressure.

In Fig. 6, 45 is the immersed pipe which ter-- minates in a chamber 46 which is sub-divided by partitions 47 and 48 and a cone 50.

pipe and 51 and 52 are openings for equalizing the liquid pressure.

In all these uid level measuring devices it is, under certain circumstances, an advantage, particularly in the case of readily evaporating and the other pipe discocks, valves or the like.

The measuring of the liquid level can in all statically or dynamically while the gas is streaming. For measuring the pressure (static measurement) has been`eifected. In the case of decreasing liquid level the pressure. gauge indication is Lasarte opening.

of the pipe with the aid of a compressed gas, means for measuring the pressure necessary therefor, and a chamber which is tted with partitions, in which the bottom end of the said pipe terminates, and having an opening at its top through which the pressure gas passes from the chamber, this opening as to throttle the discharge of gas and liquid, the dividing surface between the gas and the liquid to be measured normally lying below said opening.

2. An apparatus for measuring the liquid level in containers comprising a container for the liquid, an immersed pipe extending almost to the bottom of said container, and opening into said liquid, of the pipe ured normally lying below said openings.

3. An apparatus for measuring the liquid means for expelling said liquid out level in containers, comprising a container for the is throttled, the dividing surface between the gas and the liquid to be 4. An apparatus for measuring the liquid level of diminished openings communicating with the so that the discharge of gas and liquid is throttled, the dividing surface between the gas and the liquid to be measured lying below said openings. l

5. An apparatus for measuring the liquid level in containers, comprising a. container for the liquid, an immersed pipe extending almost to the bottom of said container, means for expelling said liquid out of the pipe with the aid of a compressed gas, means the dividing liquid to be measured lying below said opening, and means whereby the gas escaping from the chamber is caused to traverse a predetermined path through the container liquid.

, JOACHIM ERIK SCHEEL.

WERNER HERBERT BULL. RUDOLF CARL v. FREYDORF.

measured lying below said 

